气象与环境学报2016，Vol.32Issue(2)：66-71,6.DOI:10.11927/j.issn.1673-503X.2016.02.009
极涡对北太平洋风暴轴影响及成因初探
Study on impact of polar vortex on north Pacific storm track and its possible mechanism
摘要
Abstract
Based on the NCEP/NCAR reanalysis data from 1969 to 2013 ,the impacts of the northern polar vortex on the North Pacific storm track and its possible physical mechanism in recent 45 winters were analyzed. The re-sults show that storm track is mainly located in the range of 120°E—120°W,30°—60°N,and the strongest disturb-ance center is near 45°N. Singular Value Decomposition(SVD)suggests that there are two major coupled modes between the polar vortex and storm track. The first coupled mode depicts that the storm track is stronger( weaker) in the vicinity of its long-term mean locations while the polar vortex is stronger( weaker)in the polar region. The second mode depicts that as the polar vortex increases and shifts to the North Pacific,the storm track comparing to its mean state is stronger in the south of its long-term mean locations. On the contrary,as the polar vortex increases and moves to the north America,the storm track comparing to its mean state increases in the north of its long-term mean locations. A regression analysis further suggests that the anomalous change of polar vortex may give rise to change at 500 hPa geopotential height,and then change the East Asia westerly jet and the baroclinicity in the up-stream of the storm track,and finally the storm track itself.关键词
北太平洋风暴轴/北半球极涡/遥相关型Key words
North Pacific storm track/Northern polar vortex/Teleconnection pattern分类
天文与地球科学引用本文复制引用
刘鸣彦,李菲,郑石,周晓宇,崔妍,赵春雨,王颖,龚强,张海娜..极涡对北太平洋风暴轴影响及成因初探[J].气象与环境学报,2016,32(2):66-71,6.基金项目
辽宁省气象局科学技术项目“台风引发的典型流域暴雨洪涝灾害风险区划技术”（201503）、中国气象局气候变化专项“特大城市热环境变化及成因分析”（ CCSF201526）、公益性行业（气象）科研专项“近百年全球陆地气候变化监测技术与应用”（ GYHY201206012）和中国气象局气候变化专项“近百年区域气候变化序列建立及不确定性评估”（ CCSF201338）共同资助。 （）
